Exam 4: Astronomical Telescopes and Instruments

A(n)____________________ is used to measure the brightness and colour of stars.

What is the term for the technique of connecting multiple telescopes together to combine the images from each telescope?

Which of the following sequences of electromagnetic radiation shows the order of increasing energy correctly?

Which of the following types of electromagnetic radiation is absorbed by ozone in the Earth's atmosphere?

One of the advantages of charge-coupled devices (CCDs)over photographic plates is that a CCD can record bright and faint objects on the same exposure.

What is the outstanding construction feature of the largest single-dish radio telescope?

What is the light-gathering power of a telescope directly proportional to?

How do atmospheric windows limit observations made from the Earth's surface?

An astronomer takes two pictures of the same object using the Hubble Space Telescope.One picture is taken with red light and one with blue light.Which one would you expect to show finer details?

What feature of a telescope is a measure of its ability to show fine detail and depends on the diameter of the objective?

Which property of a telescope determines its light-gathering power?

What is the term for a piece of glass with many small parallel lines etched on its surface,used to produce a spectrum?

What can be done to improve the resolving power of ground-based optical telescopes?

Why do astronomers build telescopes on tops of mountains?

Which of the following types of electromagnetic radiation is absorbed by water low in the Earth's atmosphere but can be detected by telescopes on mountaintops or carried by aircraft?

Which of the following types of electromagnetic radiation has the greatest energy per photon?

The Earth's atmosphere blocks most forms of electromagnetic radiation from entering,except for ____________________ and ____________________.

What is "false" about false-colour images?

How does the nature of radio waves allow a radio telescope to use a wire mesh surface? Would you expect millimetre-wavelength telescopes to need smoother surfaces than typical radio dishes? Why or why not?

Which of the following has a few million light-sensitive diodes in an array typically measuring about one centimetre square?